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Thread: Need advice on PSU for Atom

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    Default Need advice on PSU for Atom

    Hi everyone, I need some advice on PSU choice.
    I'm planning to build a PC based on Intel D945GCLF2D Mobo with Atom processor onboard, and i'm looking for a low power PSU for it which is efficient (80+) & reliable for 24/7 operation.
    I'm hoping to keep this build for at least 5 years (can't afford to upgrade every year ).
    I'm intending to use stuffs from my current rig:
    2x HDD S-ATA 640 GB
    1x DVD-RW P-ATA
    1x 2 GB DDR2-800
    4x 8 cm case fans
    1x 12 cm case fan
    2x HDD coolers
    and a Corsair TX650W

    Here's a list of available PSU from my local stores that stay within my budget:
    1. FSP Saga II (or is it Saga+ ?) 400W
    2. Seasonic S12 II 330W
    3. Corsair VX450W

    So, which PSU should I choose from above list? but I welcome any other suggestions too.
    One more question. If I use the TX650, will it be efficient for this Atom build?

    Thanks in advance.

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    I'm not a fan of FSP, but either the Seasonic or the Corsair will do it without a problem. I believe that both are 80Plus standard certified, so they'll have about the same efficiency (they use the same platform as well IIRC).

    I doubt the TX650 will be very efficient for your build, considering you'll probably be running a load of under 75W. With that said, even with it running at 70% efficiency, your power usage is so low already that you won't be wasting very much power (about 30W, which translates to ~260kWh per year). I don't know how efficient it'll actually be at those power levels, and chances are it'll be better than that, so it might not be worth it to go for a new PSU.
    Main: i5 2500K@4.6GHz w/Zalman CNPS10X Performa, Intel DZ68BC, 8GB G.Skill DDR3-1600, PNY GTX 470 + EVGA GTX 470, ASUS Xonar DX, ADATA S510 120GB, Samsung 1TB F3+1TB F1+2TB F4, Kingwin LZG 1kW, Lian-Li PC-9F, Dell U2212HM+S2209W, Win7 Professional.
    Laptop: Dell Vostro 3450, i5 2410M, 8GB DDR3-1333, AMD Radeon HD 6630M 1GB, Intel X25-M 80GB, Seagate Momentus 750GB, Win7 Home Premium.

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    So I better stick with the TX650?
    About power consumption, I'm thinking to get a lower wattage PSU because I'm afraid my TX650 will draw more power than my Atom build need. Is that a reasonable thought?

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    Quote Originally Posted by heka View Post
    So I better stick with the TX650?
    No, I never said that. Any of the PSUs you mentioned in your first post would be enough for your build.
    Quote Originally Posted by heka View Post
    About power consumption, I'm thinking to get a lower wattage PSU because I'm afraid my TX650 will draw more power than my Atom build need. Is that a reasonable thought?
    The PSU will only draw enough power to supply the components connected to it, whether it's a 300W PSU or a 1200W PSU. The only differences in power consumption at the wall are due to the efficiency curves of each individual PSU, which are different depending on the capacity of each one and on the load percentage. In general, higher-wattage PSUs have worse efficiency at lower loads.
    Main: i5 2500K@4.6GHz w/Zalman CNPS10X Performa, Intel DZ68BC, 8GB G.Skill DDR3-1600, PNY GTX 470 + EVGA GTX 470, ASUS Xonar DX, ADATA S510 120GB, Samsung 1TB F3+1TB F1+2TB F4, Kingwin LZG 1kW, Lian-Li PC-9F, Dell U2212HM+S2209W, Win7 Professional.
    Laptop: Dell Vostro 3450, i5 2410M, 8GB DDR3-1333, AMD Radeon HD 6630M 1GB, Intel X25-M 80GB, Seagate Momentus 750GB, Win7 Home Premium.

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    Quote Originally Posted by Zero82z View Post
    I don't know how efficient it'll actually be at those power levels, and chances are it'll be better than that, so it might not be worth it to go for a new PSU.
    Sorry, I got it wrong then.

    So, perhaps the Seasonic is good choice since it got lower wattage.
    BTW, most PSU claim 100.000 hours lifespan. But AFAIK, only Corsair come with 5 years warranty with most of their PSU. And Seasonic only offers 3 years. With 24/7 operation, how long a PSU gonna last?

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    Quality PSUs can last for years.
    Main: i5 2500K@4.6GHz w/Zalman CNPS10X Performa, Intel DZ68BC, 8GB G.Skill DDR3-1600, PNY GTX 470 + EVGA GTX 470, ASUS Xonar DX, ADATA S510 120GB, Samsung 1TB F3+1TB F1+2TB F4, Kingwin LZG 1kW, Lian-Li PC-9F, Dell U2212HM+S2209W, Win7 Professional.
    Laptop: Dell Vostro 3450, i5 2410M, 8GB DDR3-1333, AMD Radeon HD 6630M 1GB, Intel X25-M 80GB, Seagate Momentus 750GB, Win7 Home Premium.

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    Ok then, thanks for your advice, Zero82z.

    Now, let's see if anyone has more suggestions.

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    I'm in the same boat - looking for an efficient psu for a HTPC.
    I came across 2 units from Delta Electronics: DPS-255EBA rated gold and DPS-255W rated silver on 80plus.org. Now let's see if I can get ahold of one of these here in Germany doesn't look good.

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    Hm, maybe you should take a look at the lower HEC Cougar PSUs, they are pretty good at low loads.

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    I can't find PSUs with output below 300W from where I live , so I can't say anything much about it.

    But I see Corsair CX400W with a good price. How does it compare to Seasonic S12-II 330W?

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